On Thursday 23 August 2001 21:18, Carroll Grigsby wrote:
> Jamie:
> If you're a migrant from Windows, you can think of a bash script as sort
> of a batch file on heavy steroids. It's usually covered in those $40
> books (Mastering..., ...Unleased, Using...); in fact there are a number
> of texts devoted to this subject -- O'Reilly is an excellent source. You
> could start with the bash programming How-To; it should be on your
> desktop under Documentation.
> You've now exhausted my expertise on the subject.
> Regards,
> Carroll
>
> "Adams, Jamie" wrote:
> > lol, not a stupid question..
> >
> > I havnt a clue what all those ' 's and $;s mean, can anyone explain this
> > script step by step?
> > -- Jamie
> >
> > >----------
> > >From: Dean Morrell[SMTP:[EMAIL PROTECTED]]
> > >Reply To: [EMAIL PROTECTED]
> > >Sent: 23 August 2001 14:22
> > >To: [EMAIL PROTECTED]
> > >Subject: Re: [newbie] File Renaming "Perks: Did someone say 'bash
> > > script'?"
> > >
> > ><<File: message.txt>>
> > >This is a newbie list right? [okay, good] I don't want to be too
> > > embarassed to ask a stuped question. Would someone be willing to
> > > explain what this does? I
> > >mean each character has significance, right? So what is it? This
> > > reminds me of the random characters thrown up on my screen after
> > > disconnecting from the old
> > >BBS.
> > >
> > >At 08:34 PM 8/22/2001 -0700, you wrote:
> > >> > for i in `ls /dirname | grep -e".+ .+"`; do mv $i `echo $i |
> > >>
> > >> gawk '{ gsub(_, ,$0) }'` ; done
> > >
> > >Dean
OK
for i in `ls /dirname`;
the phrase in backquotes will become the output of the program called--a list of files
the for statement is a for statement as in so many program languages. i is just a
variable that will
be assigned each of the filenames in succession. /dirname is the hypothetical name of
the directory
where the files exist. (You fill in your own directory name there). The | (pipe)
symbol of the original
proposed script said send all the output of the ls command to the program grep. We
can leave that out
without losing much more than a little efficiency, since grep would take only files
that matched the
pattern .+ .+ (at least one character followed by an embedded blank followed by
another character)
do mv $i `echo $i | gawk '{ gsub(_, ,$0) }'` ; done
the do is simply the sub-block where everything will happen and the instruction is mv
(move) which
renames files the $i means (evaluate the variable i here) so it is each filename in
succession, and again we
want to call output of a program(s) echo just sends the value of i through a pipe to
gawk, and
the gawk command is gsub(_, ,$0) which says globally substitute _ for ' ' in the whole
line that is passed
to you. Then we have some syntax to say "Thus endeth the loop begun with for".
Civileme
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